Yes, Im having air pump that pump air into the aquarium, and had switched off the water filter (scared if it will suck in the eggs/babies)

Dont turn the filter off how long has it been off? That maybe your problem with her being at the bottom of the tank. Never turn the filter off unless you are cleaning it or doing a water change. Do you see the bubble nest with eggs in it?

Okay first turn your filter back on so your fishy does not die please :) If there were a bubble nest you would not be able to miss it they are large and at the top of the tank. Secondly go out and buy yourself a test kit you can get them at any pet or local fish store.
If your gourami survives this ordeal and you are serious about breeding gouramis read this article http://az.essortment.com/breedinggourami_rdks.htm

You should have realize that gourami is a male. Females are rather drab and silvery in color. As for those different colors, dwarf gouramis are available in a wide range of colors nowadays. They are not that hardy these days compared to the past.

I'm ready for the pressure.
The drama and the pleasure!If there is one thing I want to see here, it's HUMOR.I believe I can fly!
I believe I can touch the sky!
I think about it every night and day!I stand in awe of my body.

I had the same problem with my honey gouramis. It seems to be a digestive disease. I wish I could be the bearer of better news, but, my female died. Unless you can entice her to eat, you can then fed her medicated food, I don't think that there is much hope. Sorry.